I am trying to figure out if it is possible to make an
expo converter that can work in positive [+] and negative [-] current source.

Not directly, because the conversion is done by a transistor, and current can only flow one way through a transistor. But you can multiply the current by a bipolar voltage, or switch its direction to get a bipolar source, eg as is commonly done in through-zero FM VCOs.

Could you have two opposing converters, one to handle the positive range and the other for the negative? Kind of like Haible's mirror core VC-HADSR._________________My synth build blog: http://gndsynth.blogspot.com/

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